What is the Pasuk referring to? What did Moshe then command them?
Rashi: Refer to 34:31:2:1.
Ramban: All that Hashem spoke to him after the episode of the Golden Calf - from what was written on the second Luchos and all that was connected to the new covenant that Hashem was making with them. 1
Seforno: It refers to before the episode of the Golden Calf - to the work concerning the construction of the Mishkan and those who served in it, and the Mitzvah of Machtzis ha'Shekel. 2